After my last post I have been really interested in MIDI control and some crazy things you might be able to do with some basic know how and some creativity. this has to be one of my favorites right now. I've heard of MIDI control with a GuitarHero axe, but mashing it up with a Korg Kaosilator is genius.
You can make one yourself. Learn how at http://www.instructables.com/id/Make-a-Korg-Kaossilator-Guitar/
Who knows you might be the brand new . . . Synth Slash!!!